I have broken this into sections, with a discussion of the various components, then wiring, then installation and other notes. I appreciate feedback and comments as I would like to incorporate these into a streamlined process for all.
When I initially researched this a few months ago, I figured out there were two decisions, with two main options :
- Towbar – OEM or Aftermarket
- Wiring – OEM, Aftermarket or Quasi OEM kl
The OEM hitch does appear to have a threaded insert which allows for use of the recovery eye in the event recovery is needed, whereas the aftermarket hitches do not.
They appear available online, but when I tried to order these from my local dealer they said the kit was not available. They are individually available as “Bolt, Hex. Hd. With Shoulder” VW Part Number N91029202, and are cheaper than the kit, but they don’t come with the washers.
This appears to be the most straightforward portion.
Going into this, let me first advise that my Touareg is the V6 Sport without the factory towing kit. Thus these notes may or may not apply.
- OEM Harness (Discontinued in US/NAR)
- Westfalia – “OEM-esque”
The easiest retailer to get these from is PF Jones in the UK. The following is a link to their site.
rness connects to the module and goes down a hole in the right rear, and the other (red and black) runs along the passenger side to the fuse box and then over to the driver’s side.
This is a close up of the braided:
They sell one of a few models, which appear to be either a 7 pin model (19270553PF) or a 13 pin model (FF29270553PF or 321766300113. I could not distinguish between the two, other than one is cheaper).
The Euro 7 Pin plug is akin to the flat 4 US/NAR plug with Left and Right Indicators, Fog Lights (not used) tail lights and brake lights independent. For more on this phillies9513 had a good discussion on this thread. (Sourcing a trailer hitch electrical installation kit (VW...) There apparently was an issue with voltage and programming, but phillies9513 appears to have resolved this.
Apparently adapters are readily sold (https://www.etrailer.com/Wiring/Tow-Ready/118710.html) which take the Euro 7 to a flat four without further wiring.
The two euro 13 plug kits appear to have the same installation instructions, so who knows what the difference is. They are also the same instructions as the Euro 7 plug. (See https://www.pfjones.co.uk/westfalia_fitting/321765300113.pdf)
It has been reported that one forum member (phillies9513) has successfully installed the 7 pin version, and used it to tow. Sourcing a trailer hitch electrical installation kit (VW... There were some electrical connection issues with voltage.
- Issues with wiring
The Euro 13 pin has lots more wires for various purposes. This list was provided by redbarron55
13 core wire colour
Cable Core Size
|1||Left Hand Indicator||Yellow||1.5|
|2||Rear fog light(s)||Blue||1.5|
|3||Earth for contacts 1 to 8||White||2.5|
|4||Right Hand Indicator||Green||1.5|
|5||Right Hand Side lights, marker lights & number plate light||Brown||1.5|
|7||Left Hand Side lights, marker lights & number plate light||Black||1.5|
|9||Positive direct from battery (Power)||Orange||2.5|
|10||Positive ignition key on (Fridge)||Grey||2.5|
|11||Earth return for contact 10||White/Black||2.5|
|12||Signaling connection to trailer||White/Blue||1.5|
|13||Earth return for contact 9||White/Red||2.5|
Lots more on this can be found on this forum and google.
Based upon this, I took the plunge and ordered the 13 pin kit. It was just under £200 or $250 US with shipping. My plan is to rewire the Euro 13 plug with the US/NAR 7 blade.
Looking at the US/NAR plug with the notch at 12:00, we have blades at 1:00, 3:00, 5:00, 7:00, 9:00, and 11:00 with a round wire in the middle. I believe this is the correct wiring sequence for the US/NAR 7 blade:
|12 V Aux||Black|
|Right Hand Indicator/Stop||Brown|
|Brakes / Trailer brake input||Blue|
|Left Hand Indicator/Stop||Red|
So cross referencing that, I believe I get the following
Open questions on wiring are
- Is Pin 6 on the Euro plug (brakes) the brake indicator?
- Do I need to run a wire from underneath the dash down along side the wiring harness for the trailer brake input? If so what gauge
- Is a relay for this needed in order to avoid low power constantly triggering small amount of trailer braking? I believe the answer to this is yes. https://www.etrailer.com/faq-tb-09-0021-Tekonsha.aspx
- Do I need to purchase a 3-2 wiring converter (which turns three wire LH/RH/brake into a 2 wire system which carries brake and turn signals along the same wire) This is one, but there are a few others which may or may not have issues with LED lights on the trailer. https://www.etrailer.com/Wiring/Roadmaster/RM-732.html
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